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Exploited. On CISA's list since 2022-05-24, and used by ransomware.
CVE-2018-19953 · QNAP Network Attached Storage (NAS) · Published 2020-10-28
6.1 out of 10
CVSS rates it medium.
31%
Estimated chance of exploitation in the next 30 days, higher than 98% of all scored flaws (EPSS, 2026-10-29).
Yes
CISA has seen it exploited in real attacks. For US government agencies the fix is deadline passed 1599 days ago (2022-06-14).
Apply updates per vendor instructions.
A cross-site scripting vulnerability affecting QNAP NAS File Station could allow remote attackers to inject malicious code.
If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.
From the NVD.
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CWE-79 · CISA KEV; NVD record: nvd@nist.gov; NVD record: security@qnapsecurity.com.tw
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CWE-80 · CISA KEV; NVD record: security@qnapsecurity.com.tw. We have not selected a close learning match for this label.
CWE is a catalogue of weakness types. Labels come from the sources shown and can differ or change. Resource matches reviewed 16 October 2026.
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Exploited flaws from CISA's KEV catalogue. Chance of exploitation from EPSS by FIRST. Descriptions and scores from the NVD. This product uses the NVD API but is not endorsed or certified by the NVD.